1. They believe that he has left the city.
  2. People think that she is very talented.
  3. They assume that the company will announce the results soon.
  4. People say that the building is haunted.
  5. They report that the new policy has been implemented.
  6. Everyone knows that exercise is good for health.
  7. They believe that the economy will recover next year.
  8. People claim that he won the lottery.
  9. They think that she will become the next CEO.
  10. People say that the weather will improve tomorrow.
  11. They expect that the film will break box office records.
  12. People believe that the vaccine is effective.
  13. They assume that the negotiations will continue.
  14. Everyone knows that time is precious.
  15. People say that the artist has a unique style.
  16. They report that the mission was successful.
  17. People believe that the earth is flat.
  18. They think that the problem can be solved easily.
  19. People say that she wrote the book herself.
  20. They expect that the festival will attract many visitors.

Answers

  1.  It is believed that he has left the city.
     He is believed to have left the city.

  2.  It is thought that she is very talented.
     She is thought to be very talented.

  3.  It is assumed that the company will announce the results soon.
    The company is assumed to announce the results soon.

  4.  It is said that the building is haunted.
     The building is said to be haunted.

  5.  It is reported that the new policy has been implemented.
     The new policy is reported to have been implemented.

  6.  It is known that exercise is good for health.
     Exercise is known to be good for health.

  7.  It is believed that the economy will recover next year.
     The economy is believed to recover next year.

  8.  It is claimed that he won the lottery.
     He is claimed to have won the lottery.

  9.  It is thought that she will become the next CEO.
     She is thought to become the next CEO.

  10.  It is said that the weather will improve tomorrow.
     The weather is said to improve tomorrow.

  11.  It is expected that the film will break box office records.
     The film is expected to break box office records.

  12.  It is believed that the vaccine is effective.
     The vaccine is believed to be effective.

  13.  It is assumed that the negotiations will continue.
     The negotiations are assumed to continue.

  14.  It is known that time is precious.
     Time is known to be precious.

  15.  It is said that the artist has a unique style.
     The artist is said to have a unique style.

  16.  It is reported that the mission was successful.
     The mission is reported to have been successful.

  17.  It is believed that the earth is flat.
     The earth is believed to be flat.

  18.  It is thought that the problem can be solved easily.
     The problem is thought to be easily solved.

  19.  It is said that she wrote the book herself.
     She is said to have written the book herself.

  20.  It is expected that the festival will attract many visitors.
     The festival is expected to attract many visitors.